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Composition and origin of the Çaldağ oxide nickel laterite, W. Turkey
Springer Science and Business Media LLC - Tập 44 Số 5 - Trang 581-595 - 2009
Trace element composition of scheelite in orogenic gold deposits
Springer Science and Business Media LLC - Tập 55 Số 6 - Trang 1149-1172 - 2020
Scheelite from 25 representative orogenic gold deposits from various geological settings was investigated by EPMA (electron probe micro-analyzer) and LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometer) to establish discriminant geochemical features to constrain indicator mineral surveys for gold exploration. Scheelite from orogenic gold deposits displays five REE patterns inclu...... hiện toàn bộ
Komatiites and nickel sulfide ores of the Black Swan area, Yilgarn Craton, Western Australia. 2: Geology and genesis of the orebodies
Springer Science and Business Media LLC - Tập 39 - Trang 707-728 - 2004
The Black Swan Ultramafic Succession hosts a number of magmatic Fe–Ni–Cu–PGE sulfide ore shoots, ranging from high grade massive ore to low grade disseminated sulfides. Of these, the most economically significant is the Silver Swan massive sulfide orebody, associated with the basal contact of the succession. The deposit varies in thickness between 5 and 20 m, reaches a N–S strike length of 75 m, e...... hiện toàn bộ
Economic potential of the ultramafic rocks of Jamaica and Tobago: two contrasting geological settings in the Caribbean
Springer Science and Business Media LLC - Tập 34 - Trang 718-723 - 1999
Ultramafic rocks in Jamaica are dunites with minor lherzolite, often serpentinised, and are part of a dismembered ophiolite complex. In Tobago, dunites, wehrlites, pyroxenites and hornblendites form the lower part of a plutonic complex of island arc affinity. The mineral assemblages and chemistry reflect these differences. Chromite in Jamaica is high in Al and Mg, whereas in Tobago it is rich in ...... hiện toàn bộ
Formation of albitite-hosted uranium within IOCG systems: the Southern Breccia, Great Bear magmatic zone, Northwest Territories, Canada
Springer Science and Business Media LLC - Tập 50 - Trang 293-325 - 2014
Uranium and polymetallic U mineralization hosted within brecciated albitites occurs one kilometer south of the magnetite-rich Au–Co–Bi–Cu NICO deposit in the southern Great Bear magmatic zone (GBMZ), Canada. Concentrations up to 1 wt% U are distributed throughout a 3 by 0.5 km albitization corridor defined as the Southern Breccia zone. Two distinct U mineralization events are observed. Primary ura...... hiện toàn bộ
Sulfur and lead isotope geochemistry of hypogene mineralization at the Barite Hill Gold Deposit, Carolina Slate Belt, southeastern United States: a window into and through regional metamorphism
Springer Science and Business Media LLC - - 2001
Effects of mass transfer, compaction and secondary porosity on hydrothermal upgrading of Paleoproterozoic sedimentary manganese ore in the Kalahari manganese field, South Africa
Springer Science and Business Media LLC - Tập 32 - Trang 250-256 - 1997
In the northwestern part of the Kalahari manganese field low-grade carbonate-rich Mamatwan-type ore is altered to high-grade oxide-rich Wessels-type ore in association with normal faults. Mass balance calculations, based on the assumption that manganese was geochemically immobile, suggest that upgrading of the manganese ore can be attributed to leaching of Mg, Ca, CO2 and SiO2 from the sedimentar...... hiện toàn bộ
Lead-zinc ores dependent on cyclic sedimentation
Springer Science and Business Media LLC - Tập 10 - Trang 234-248 - 1975
Lagoonal sediments of the upper part of the Wetterstein-limestone (Ladinian/Carnian, Alpine Triassic) of the lead-zinc deposit of Bleiberg-Kreuth were examined. They are influenced by cyclic successions, which show emersion periods. These emersions can also be found in similar rocks of the same age. The cyclothems are attributed to eustatic fluctuations. In the rocks, underlying the unconformity, ...... hiện toàn bộ
Pongkor (west Java, Indonesia): a Pliocene supergene-enriched epithermal Au-Ag-(Mn) deposit
Springer Science and Business Media LLC - Tập 34 - Trang 131-149 - 1999
The Pongkor gold-silver epithermal deposit with reserves of at least 98 tonnes of gold and 1026 tonnes of silver, average grades 16.4 g/t Au and 171.2 g/t Ag is one of the most recent and largest gold and silver discoveries in Indonesia, proven within a short period (1988–1991). 40Ar/39Ar dating on adularia samples give an age of 2.05 ± 0.05 Ma. The deposit is of the low-sulfidation epithermal ty...... hiện toàn bộ
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